Due to the high educational expertise required for valid participants, we were only able to recruit 64 valid participants within the time-frame of the study. The number of participants varied per discipline: 33 Chemistry, 19 Computer Science (CS) and 27 Education.
We note that even though our samples are not uniform, our results still provide valuable insights: there is no magic number for participants required in a study [1]} and visualization studies often have small numbers of participants with relevant results [2]}, [3]}. And when it comes to statistical evidence, confidence intervals (CIs) with just a hand-full of participants can still provide evidence of differences [4]}.
